# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-2.6.32-gentoo
Found linux image: /boot/vmlinuz-2.6.32-gentoo.old
/proc/misc: No entry for device-mapper found
Failure to communicate with kernel device-mapper driver.
Check that device-mapper is available in the kernel.
No volume groups found
done